['Size and Weight Limits']
['Sizes and weights']
05/27/2025
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Under CFR 23 – Highways – Part 658 outlines regulations for Truck Size and Weight. Section 658.13 Length – reads that the length provisions of the STAA apply only to the following types of vehicle combinations:
- Truck tractor-semitrailer
- Truck tractor-semitrailer-trailer
The length provisions apply on the above combinations only when being operated on the National Network System, No state shall impose a length limitation of less than 48 feet on a semitrailer operating in a truck tractor-semitrailer combination; or 28 feet on any semitrailer or trailer operating in a truck tractor-semitrailer-trailer combination.
NOTE: Under Section 658.16 Exclusions from Length and Width Determinations, and Appendix D to Part 658, there are certain components that are excluded by law or regulation from being included in the length measurement of a commercial motor vehicle.
State comparison
| Interstate and designated Federal Aid highways | State and other supplemental highways | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| State | Straight Trucks | Tractor-semitrailer combinations | Semitrailer | Tractor-twin-trailer combination | Trailers of twin-trailer combinations | Straight Trucks | Tractor-semitrailer combinations | Semitrailer | Tractor-twin-trailer combination | Trailers of twin-trailer combinations |
| Alabama | 40' | No limit | 57' see KPRA | No limit | 28' 6" | 40' | No limit Except for auto-transporters and livestock haulers | 53' see KPRA | No limit | 28' 6" Allowed on all 4-lane U.S. routes and some 2-lane U.S. routes. |
| Alaska | 45' | No limit | 53' Can be route restricted to 48' | 75' | 48' | 45' | 75' | 53' Can be route restricted to 48' | 75' | 48' |
| Arizona | 40' | No limit | 57' 6" | No limit | 28' 6" | 40' | No limit | 53' or total length of 65' if semitrailer exceeds 53' | 65' | 28' 6" |
| Arkansas | 40' | No limit | 53' 6" | No limit | 28' When in use prior to December 1982: 28' 6" | 40' | No limit | 53' 6" | No limit | 28' When in use prior to December 1982: 28' 6" |
| California | 40' | No limit with legal trailer | 53' For trailers over 48' see KPRA | No limit if trailers are 28' 6" or less | 28' 6" | 40' | 65' see KPRA | No limit On "California legal" routes so long as overall length does not exceed 65' and KPRA compliant | 75' With two 28' 6" trailers. 65' with one 28' 6" trailer and one longer | 28' 6" |
| Colorado | 45' | No limit if trailer is 57' 4" or less | 57' 4" | No limit if trailers are 28' 6" or less | 28' 6" | 45' | No limit if trailer is 57' 4" or less | 57' 4" | No limit if trailers are 28' 6" or less | 28' 6" |
| Connecticut | 45' | No limit With 53' semitrailer | 53' see KPRA | No limit With 28' semitrailers | 28' | 45' | No limit With 48' semitrailer | 48' | NS | NS |
| Delaware | 40' | No limit | 53' | No limit | 29' | 40' | 60' | 53' | 60' | 29' |
| District of Columbia | 40' | No limit | 53' Route specific. See KPRA. | No limit Route specific | 28' | 40' | 55' | 48' Route specific | No limit Route specific | 28' Route specific |
| Florida | 40' | No limit with legal trailer | 53' see KPRA | No limit with legal trailers | 28' | 40' | No limit with legal trailer | 53' see KPRA | No limit with legal trailers | 28' |
| Georgia | No limit w/legal trailer | 53' | No limit If 28' 6" trailers are used, maximum total length may not exceed 65' | 28' | 100' unless otherwise limited. Such routes will be posted – except NHS routes | 53' unless route is posted otherwise | No limit w/legal trailer If 28' 6" trailers are used, maximum total length may not exceed 67' 6" | 28' | ||
| Hawaii | 45' | N/S | 48' | N/S | 45' | 65' | 48' | 65' | ||
| Idaho | 45' | 75' unless otherwise noted | 53' | 68' of trailers including tongues | 68' of trailers including tongues | 45' | 75' unless otherwise noted | 48' | 61' of trailers including tongues or 75' overall | 61' of trailers including tongues or 75' overall |
| Illinois | 42' | NS | 53' see KPRA | NS for Class I & II highways. 65' center of front axle to center of rear axle for Class II highways. | 28' 6" | 42' | 65' | 53' see KPRA | 60' | NS |
| Indiana | 40' Permanently installed specialized equipment used for lifting, reaching, pumping, or spraying are allowed an additional 5' overhang. | No limit | 53' see KPRA | No limit | 28' 6" | 40' Permanently installed specialized equipment used for lifting, reaching, pumping, or spraying are allowed an additional 5' overhang. | No limit | 53' see KPRA | No limit | 28' 6" |
| Iowa | 45' | No limit with legal trailer | 53' 57' lowboy trailers allowed for the transport of construction equipment in a tractor semitrailer combination | No limit with legal trailer | 28' 6" | 45' | No limit with legal trailer | 53' 57' lowboy trailers allowed for the transport of construction equipment in a tractor semitrailer combination | No limit with legal trailer | 28' 6" |
| Kansas | 45' | No limit | 59' 6" | No limit | 28' 6" | 45' | No limit | 59' 6" | No limit | 28' 6" |
| Kentucky | 45' | No limit with legal trailer | 53' | No limit | 28' | 45' May restricted to 26' 6" based on the strength, safety, and durability of the highway | 65' | N/S | Not allowed | N/S |
| Louisiana | 45' | No limit with legal trailer | 59' 6" | No limit with legal trailer | 30' | 45' | 65' | N/S | Not allowed | Not allowed |
| Maine | 45' | No limit with legal trailer | 53' see KPRA | No limit with legal trailer | 28' 6" | 45' | 69' with 48' trailer, 74' with 53' trailer | 53' see KPRA | N/S 28' 6" semi-trailer and 28' 6" straight trailer | 28' 6" |
| Maryland | 40' | No limit | 53' see KPRA | No limit | 28' | 40' | No limit | 48' | Not allowed | Not allowed |
| Massachusetts | 40' | No limit with legal trailer | 53' | No limit with legal trailers | 28' | 40' | No limit with legal trailer | 53' | No limit with legal trailers | 28' |
| Michigan | 40' | No limit with legal trailer | 53' | 58' from front of first to back of last axle or 28' 6" each trailer | 28' 6" | 40' | No limit with legal trailer | 50' | 59' | N/S |
| Minnesota | 45' | NS | 53' see KPRA | N/S | 28' 6" | 45' | 75' | 53' see KPRA | Allowed only on state-designated routes | 28' 6" |
| Mississippi | 40' | No limit | 53' | No limit | 30' | 40' | No limit | 53' | No limit | 30' |
| Missouri | 45' | No limit | 53' | No limit | 28' includes load | 45' | 60' | N/S | 65' | N/S |
| Montana | 55' | No limit with legal trailer | 53' | No limit with legal trailer or 61' combined trailer length | 28' 6" or 61' combined | 55' | No limit with legal trailer | 53' | No limit with legal trailer or 61' combined trailer length | 28' 6" or 61' combined |
| Nebraska | 40' | No limit | 53' | No limit | 65' measured from front of 1st trailing unit to rear of 2nd | 40' | No limit | 53' | No limit | 65' measured from front of 1st trailing unit to rear of 2nd |
| Nevada | 40' | No limit | 53' | No limit | 28' 6" | 40' | No limit | 53' | No limit | 28' 6" |
| New Hampshire | 45' | 53' see KPRA | N/S | 28' | 45' | 48' | N/S | 28' only on state-designated routes | ||
| New Jersey | 40' 50' when transporting items that cannot be divided | No limit | 53' see KPRA | No limit | 28' | 40' 50' when transporting items that cannot be divided | No limit | 48' | Only allowed on NJ double-trailer truck network | 28' |
| New Mexico | 40' | No limit with legal trailer | 57' 6" | No limit with legal trailer | 28' 6" | 40' | 65' | N/S | 65' | 28' 6" |
| New York | 40' | No limit with legal trailer | 53' see KPRA. Severely restricted in NYC | No limit with legal trailer | 28' 6" | 40' | 65' | 48' | 65' | 28' 6" |
| North Carolina | 40' | No limit with legal trailer | 53' see KPRA | No limit allowed on highways designated for STAA dimensioned vehicles | 28' | 40' | No limit with legal trailer | 53' see KPRA | Not allowed | Not allowed |
| North Dakota | 50' | No limit | 53' | 110' | 100' total on a semitrailer and trailer | 50' | 75' 2-, 3-, and 4-unit combinations, 110' on 4-lane divided highways, 95' on most state highways | 53' | 75' 2-, 3-, and 4-unit combinations, 110' on 4-lane divided highways, 95' on most state highways | NS |
| Ohio | 50' | No limit with legal trailer | 53' | No limit | 28' 6" | 50' | No limit with legal trailer | 53' | No limit | 28' 6" |
| Oklahoma | 45' | No limit with legal trailer | 53' | No limit with legal trailers | 53' Not to exceed 110' cargo-carrying capacity limits on Interstate and 4-lane divided highways only | 45' | No limit with legal trailer | 53' | No limit with legal trailers | 29' |
| Oregon | 40' | No limit with legal trailer | 53' | No limit with legal trailer limit | 40' both trailing units together measured from the front of the 1st trailer to the rear of the 2nd trailer may not exceed 68' | 40' | 60' 53' trailer on a Group 1 highway, or 40' trailer on a Group 2 highway | 53' on a Group 1 highway, 40' trailer on a Group 2 highway | 75' on a Group 1 highway, 65' on a Group 2, and 60' on a Group 3 highway | Total length restricted |
| Pennsylvania | 40' See length special limitations for boom trucks | No limit | 53' see KPRA | No limit | 28' 6" | 40' See length special limitations for boom trucks | No limit | 53' see KPRA | Not allowed | Not allowed |
| Rhode Island | 40' | No limit | 53' see KPRA | No limit | 28' 6" | 40' | No limit | 48' 6" | No limit on designated roadways only | 28' 6" on designated roadways only |
| South Carolina | 40' | No limit | 53' | No limit | 28' 6" | 40' | No limit | 53' | Not allowed | Not allowed |
| South Dakota | 45' | No overall limit | 53' | No overall limit | 28' 6" if towbars do not exceed 19' and the overall length of the trailer-trailer unit including towbars does not exceed 80'. | 45' | No overall limit | 53' | No overall limit | 28' 6" if towbars do not exceed 19' and the overall length of the trailer-trailer unit including towbars does not exceed 80'. |
| Tennessee | 45' | No limit | 53' | No limit | 28' 6" | 45' | No limit | 53' | Not allowed | Not allowed |
| Texas | 45' | No limit with legal trailer | 59' | No limit with legal trailer | 28' 6" | 45' | No limit with legal trailer | 59' | No limit with legal trailer | 28' 6" |
| Utah | 45' | No limit with legal trailer | 53' | No limit if coupled trailers measure 61' or less | 61' measured from front of first trailing unit to rear of second | 45' | No limit with legal trailer | 53' | No limit if coupled trailers measure 61' or less | 61' measured from front of first trailing unit to rear of second |
| Vermont | 46' | No limit with legal trailer | 53' see KPRA | No limit with legal trailer | 28' | 46' | 75' on US RT 4 from the New Hampshire line to the Jct. of VT RT 100 South a no-fee permit is required if the length is 68' to 72'. If length exceeds 72', a single trip permit is required. | 53' see KPRA | Not allowed unless on approved routing | Not allowed unless on approved routing |
| Virginia | 40' | No limit | 53' see KPRA | No limit | 28' 6" | 40' | No limit Unless prohibited | 53' see KPRA | Not allowed | Not allowed |
| Washington | 40' | No limit with legal trailer | 53' | No limit with legal trailer limit | 61' measured from front of 1st trailing unit or load to rear of 2nd trailing unit or load | 40' | No limit with legal trailer | 53' | No limit with legal trailer limit | 61' measured from front of 1st trailing unit or load to rear of 2nd trailing unit or load |
| West Virginia | 40' | No limit | 53' | No limit with legal trailers | 28' | 40' | 70' | 48' on lanes under 10' wide | Not allowed | Not allowed |
| Wisconsin | 45' | No limit | 53' see KPRA | No limit | 28' 6" | 45' | 75' on state trunk highways | 53' see KPRA | Not allowed | Not allowed |
| Wyoming | 60' | No limit | 60' | NS | 81' not to exceed in combined length. Maximum 48' for 1st semitrailer and 40' for the second trailer. Heavier trailer in front if difference of GVW exceeds 5,000 lb. | 60' | No limit | 60' | NS | 81' not to exceed in combined length. Maximum 48' for 1st semitrailer and 40' for the second trailer. Heavier trailer in front if difference of GVW exceeds 5,000 lb. |
['Size and Weight Limits']
['Sizes and weights']
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Copyright 2025 J. J. Keller & Associate, Inc. For re-use options please contact copyright@jjkeller.com or call 800-558-5011.